Adjustable school seat and desk.



Patented Aug; 22, I899.

No. 63 l,559.

B. CLARK. ADJUSTABLE SCHOOL SEAT AND DESK.

(Applicatio n filed May 20, 1899.)

2 Sheets-Sheet I.

(No Model.)

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Patented Aug. 22, I899.

B. CLARK. ADJUSTABLE SCHOOL SEAT AND DESK.

(Application filed May 20, 1899.)

2 Sheets$heet 2.

(No Model.)

UNITED STATES PATENT OFFICE.

BYRON CLARK, OF ELGIN, ILLINOIS, ASSIGNOR TO THE C. H. \VOODRUFFCOMPANY, OF SAME PLACE.

ADJUSTABLE SCHOOL SE AT AND DESK.

SPECIFICATION forming part of Letters Patent No. 631,559, dated August22, 1899.

Application filed May 20,1899. Serial No. 717,571. N d l.)

To all whorrt it may concern:

Be it known that I, BYRON CLARK, a citizen of the United States,residing at Elgin, in the county of Kane and State of Illinois, haveinvented certain new and useful Improvements in Adjustable School Seatsand Desks, of which the following is a specification.

The object of my invention is to provide a simple, economical, andefficient adjustable school seat and desk; and the invention consists inthe features, combinations, and details of construction hereinafterdescribed and claimed.

In the accompanying drawings, Figure 1 is a side elevation of a portionof a school seat and desk constructed in accordance with my improvementsand looking at it from the outside; Fig. 2, a similar view looking atthe parts from the inside; Figs. 3 and 4, transverse sectional viewstaken on the lines 3 and 4 of Fig. 2; Fig. 5, a vertical sectionalelevation of a portion of the mechanisms taken on line 5 of Fig. 2; Fig.6, a detail view of aportion of the desk; Fig. 7, a detail view of aportion of the seat and back portions; Fig. 8, a detail view of the capfor confining the adj ustable spirals; Fig. 9, a detail view of thestandard, and Fig. an enlarged view of the adjustable spiral.

In the art to which this invention relates it is well known that it ishighly desirable to provide a school seat and desk with means by whichthe seat and desk portions may be adjusted independently and as quicklyas pos sible, and to this end my invention is primarily designed. v p

In constructing .my improvements I make a standard or leg portion A ofthe desired size, shape, and strength to support and hold the otherparts in desired positions. A desk portion is slidingly mounted uponbolts 12 which are passed through the holes a a and the elongated slotsb b of the desk, which bolts act as guides for the desk. The seatportion C is slidingly mounted upon bolts a, which are passed throughthe holes a in the standard and through the elongated slots 0 of theseat portion.

The desk and seat portions, as will be seen from the above and anexamination of the drawings, are slidingly mounted upon the inner sideof the standard, so that they have independent motions. It is thereforedesirable that mechanism be provided by which these motions- L1 6., theraising and lowering of the 'seat and desk portions'may be accomplishedeconomically and efficiently and the parts sustained in their adjustedpositions. To accomplish this result, the standard is provided withfixed projecting teeth or lugs a and a and the desk and seat portionsprovided with lugs b and 0, respectiyely, extending inwardly andarranged in the same vertical plane or, in other words, in line witheach other vertically. Rotatable spirals D and D are provided andvertically movably mounted in the recessed portions e of the cap E,which cap is secured to the standard by the stove-bolts that form theguides for the desk and seat portions. As will be noticed from aninspection of Figs. 8 and 10, these rotatable spirals are provided withraised portions d, arranged in the form of a spiral and projectinginwardly, so as to engage, as shown in Fig. 5, at one side of theirdiameters with the fixed teeth on the standard and on the other side oftheir diameters with the teeth upon the adjustable seat and deskportions. These rotatable spirals are provided with polygonal openings(1, preferably square, extending through the axes thereof, so that asquare key may be passed through one and, if necessary, extended longenough to pass through the spiral on the opposite standard of the desk.

In operation the parts are assembled as shown in Figs. 1, 2, and 5, andif it be desired to adjust the seat independently of the desk the key ispassed through the opening (1 in the spiral D, the lower spiral. Therotation of the key turns or rotates the spiral, which climbs up on thefixed teeth of the standard, and at the same time pushes the teeth ofthe seat portion upwardly by its vertical movement and gives it a doublevelocity in an upward direction on account of the spiral independentlymoving the teeth upwardly. A reverse rotation lowers the seat, and thesame is true as regard the raising and lowering of the desk.

The principal advantage incident to the use of my improvements is thatthe spiral raises or lowers the seat or desk portion at a doublevelocity--that is, it raises or lowers it with its own vertical movementand accelerates it on account of the engagement with the spiral. Afurther advantage is that the teeth engaging the spiral directly abovethe center thereof prevent displacement of the parts after the necessaryadjustment has been obtained.

I claim- 1. In a combined school seat and desk of the class described,the combination of a standard having teeth fixed thereto, a movableportion such as a desk or seat portion slidingly mounted on the standardhaving teeth fixed thereto, and a rotatable spiral slidingly mounted soas to have vertical movement and engaging with the fixed teeth of thestandard and of the movable portion whereby a double velocity is givento the raisin g and lowering of the movable portion, substantially asdescribed.

2. A combined school desk and seat, C0111- prising a standard providedwith two sets of teeth arranged in a vertical line, a seat por' tionslidingly mounted on the standard and having teeth thereon arranged ina. vertical line with the teeth on the standard, a desk portionslidingly mounted on the standard and having teeth projecting therefromand arranged in a vertical line with the teeth on the standard and onthe seat portion, a cap portion secured to the standard and providedwith two recesses arranged in a vertical line with each other, arotatable spiral arranged in each of the recesses and having the teethengaging with the fixed teeth on the standard and on the seat portionwith the fixed teeth on the standard and on the desk, respectively,whereby the rotation of both will raise or lower the desk and seatportions at a double velocity, substantially as described.

BYRON CLARK.

\Vitnesses:

OSCAR JoNEs, J. E. BAKKER.

